hellotag.java

簡單的多個實例的tag技術,剛入門不久的程序員,多多關照

package com.jspdev.ch14;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.util.Hashtable;
import java.io.Writer;
import java.io.IOException;
import java.util.Date;       

/**
 *演示从TagSupport继承来开发标签
 */
public class HelloTag extends TagSupport
{
    /**
     *覆盖doStartTag方法
     */
    public int doStartTag() throws JspTagException {
	return EVAL_BODY_INCLUDE;
    }
    
    /**
     *覆盖doEndTag方法
     */
	public int doEndTag()throws JspTagException
	{
		String dateString =new Date().toString();
		try
		{
			pageContext.getOut().write("Hello World hellking.代刚tag<br>"+dateString);
			
		}
		catch(IOException ex)
		{
			throw new JspTagException("Fatal error:hello tag conld not write to JSP out");
		}
		return EVAL_PAGE;
	}
}